Automatic welding method for microdeformation of cylinder sleeve of bottom upright of large hydraulic support

Abstract

The invention discloses an automatic welding method for the microdeformation of a cylinder sleeve of a bottom upright of a large hydraulic support, belonging to the technical field of laser welding and relating to a welding method for a cylinder sleeve of a bottom upright of a hydraulic support, in particular to a self-fluxing high-energy rapid laser input welding method capable of controlling deformation in a welding process. The automatic welding method for the microdeformation of the cylinder sleeve of the bottom upright of the large hydraulic support, provided by the invention, can be used for effectively controlling the deformation after the cylinder sleeve is welded, so that the stroke of the bottom upright of the hydraulic support is up to the maximum. The method is carried out according to the following steps of: fixing a to-be-welded cylinder sleeve of the bottom upright of the hydraulic support and a base of the cylinder sleeve on a chuck of a numerical control machine tool; filling iron-base alloy powder into a powder feeding device coaxial with the optical axis of a laser beam of a laser; setting the parameter of the powder feeding device and the laser welding parameter of the laser; and starting the laser, the powder feeding device and the numerical control machine tool to automatically finish the welding process.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and relates to a welding method for a cylinder liner of a bottom column of a hydraulic support. In particular, it relates to a self-fluxing high-energy rapid-input laser welding method capable of controlling deformation during the welding process. Background technique [0002] The hydraulic support is an important part of the heavy hydraulic equipment used in coal mines. It forms an organic whole with the drum shearer, the flexible scraper conveyor, the reloader and the belt conveyor, etc., and realizes the main processes of mining, support and transportation. The comprehensive mechanized coal mining technology has brought the longwall coal mining technology into a new stage. It can support and control the roof of the working face, isolate the goaf, prevent gangue from entering the mining face, maintain a safe underground working space, and realize the processes of coal dropping, coal load...

AI Technical Summary

Problems solved by technology

However, due to the continuous high heat input during the welding process, the deformation after welding cannot be effectively controlled, and the deformation (ellipticity) is less than or equal to 0.3mm

[0007] In the welding process of the above welding method, the heat input is large and the heat accumulation is large, which makes the heat-affected zone of the weldment large, and will generate a large binding force after welding, which is easy to cause local stress concentration and large deformation.

Even if post-heat treatment is carried out after welding to eliminate part of the residual stress, the deformation (ellipticity) of the cylinder liner is large due to the large impact of heat during welding.

Since the bottom column of the hydraulic support is an important connecting piece connecting the base, the top beam, the cover beam, etc., the small deformation of the cylinder liner can affect the piston in the cylinder liner that cannot reach its bottom end, and affect the maximum stroke of the bottom column of the hydraulic support. Make the roof working surface can not work normally

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